John sheffield



JOHN SHEFFIELD, OF P'ULTNEYVILLE, NEW YORK.

APPARATUS FOR FILING MILL-SAWS.

Specification of Letters Patent No. 11,033, dated JuneG, 1854.

To all whom t may concern.'

Be 1t known that I, JOHN SHEFFIELD, of

`Pultneyville, in the county of `VVayne and State of New York, have invented certain new and useful Improvements in Apparatus to be Used in Filing MillvSaws when in the Frame or Gate; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specication, in which- Figure 1 represents a front view, looking toward the edge of the saw, and Fig. 2, represents a vertical section taken through the frame on one side of the saw.

Similarletters on both the gures denote like parts.

The nature of my invention relates to the suspending of a pair of stirrups or file supporters, which are controlled by a weight or its equivalent, so that the file shall be held up against the under or square part of the tooth in a horizontal manner and with suficient force as to only require the operator to give the file its transverse movement, it being held up and guided by the supporters and the weight.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings.

In filing mill saws in the gat-e o-r sash the operator labors under great diiiculty, being unable to see his work while filing, as it is the under part of the tooth which requires the most accurate work. In his bent position he is unable to tell whether his file is square up to the tooth, and a saw in a frame is altogether in its most awkward position to be conveniently or accurately tiled.

My object therefore is to aid the operator lmechanically in that part of his labor which is the most diiiicult.

`A, A represent the side pieces of a frame, which may be conveniently attached to any part of the frame of the mill over the saw gate or saw. In the top of these side pieces other, and vice versa.

'simple contrivance is at once obvious.

is arranged `a roller B, having attached to it a cord O, to the extreme lower end of which .is fastened a weight D, of any suitable size. Two cords E E, are also arranged on this roller, which have on their lower ends stirrups or file holders and guides F. The cord C, which carries the weight, and the cords E E, which support the file holders, should be so wound upon the roller that the unwinding of one will wind up the This gives to the file holders an adjustable character, which admits of their being used from one end of the saw tothe other, and when not required for immediate use they, as well as the-weight, may be raised up out of the way.

The operation and advantage of this vely T e point of the file is placed in one of the file holders, and the heel of it in the other. The operator places the le thus hung against the underside of one of the teeth, and the weight D, holds it there in a horizontal position and with power sufficient to cause the file to cut against the tooth. It is only necessary for the operator to work the le back and forth and it cuts with accuracy and despatch. The weight should be from twenty to thirty pounds, and the operator is relieved from the equivalent of that weight, while he may stand erect to work the file. Besides, files which are actually worn out for hand ling can be economically used with this apparatus.

Having thus fully described the nature of my invention, what I claim therein as new and desire to secure by .Letters Patent is- The arrangement of the stirrups, cords, weight and rollers for holding, guiding and supporting a le while filing a saw inthe gate or frame, substantially in the manner herein represented.

JOHN SHEFFIELD.

Vitnesses D. C. HIGGINS, R. REYNOLD. 

